Sun System� LEC� Brand Inner Sun� PGZX Socket Assembly utilizes cutting edge Light Emitting Ceramic� brand technology (ballast required). This unit is ideal for inner canopy and supplemental lighting applications. These sockets come with the patented male lamp receptacle which is compatible with Galaxy� LEC� brand and Sun System� 1 LEC� brand 315 electronic ballasts. The Inner Sun� has a flexible pigtail strain relief with a ceramic open-rated PGZX socket. Comes with a white powder-coated junction box. US Patent Pending: 29/542,729. Chinese Patent: ZL2016301246206.